But though we all know of one -- exactly one -- person who thinks that Blake Shelton fits the bill: Gwen Stefani.

Well, now Blake and Gwen are reportedly trying something that could bring them even closer: getting pregnant.

Gwen Stefani and Blake Shelton started dating in late 2015.

Gwen had split with Gavin Rossdale, reportedly after discovering that he was cheating with the nanny.

Here's a tip, folks: if you're going to leave an electronic trail of your adultery, maybe make sure that it's not synched to all devices and that there's no chance that your wife could just happen upon it.

(They also report that Gavin Rossdale is getting super bitter about Blake's role in the lives of his children, so this is unlikely to improve things)

This claim is further supported by Blake Shelton himself.

Blake was promoting his clothing line (titled "BS," which are his initials but ... he could have gone in a different direction with that) earlier this month when a fan asked him if he and Gwen were going to have any kids.

"I hope. We will see."

He could have just told the fan that it was none of their business.

So ... they're not even keeping it a secret anymore.

But Gwen Stefani is 48, folks.

She was 42 when she had her youngest, but ... a lot can change in a person's body in six years.

Sure, the two of them are trying, but there's no guarantee that she and the alleged "Sexiest Man Alive" can produce a baby.

You'd think that they'd just adopt, especially since a pregnancy at Gwen's age could produce serious risks for her and for the baby, but apparently Blake wants a biological child.

And apparently Gwen is so besotted that she's willing to go along with it.